Nyloc nut

Nylon Insert Lock Nut

A nyloc nut, also referred to as a nylon insert lock nut, polymer insert lock nut, or elastic stop nut, is a kind of locknut. It is a nut with a nylon collar insert that resists turning.

The plastic insert is placed at the end of the nut and its inner diameter (ID) is slightly smaller than the major diameter of the screw. The insert deforms elastically over the threads of the screw, but threads are not cut into the nylon. The nylon insert locks the nut by applying a compressive force against the screw. Nyloc nuts retain their locking ability up to 250 °F (121 °C).^[1]

Trademark

"Nyloc" is a registered trade name of Forest Fasteners.^[2] In Australia "Nyloc" is a registered trade mark of Exafast Pty Ltd.

Related fasteners

A nylon pellet nut is very similar to a nyloc nut except that it uses one or more smaller nylon inserts instead of a ring of nylon. They do not lock as strongly as nyloc nuts.^[1]

Reuse safety

Authorities disagree on whether nyloc nuts should be reused. For example, Carroll Smith (Carroll Smith's Nuts, Bolts, Fasteners, and Plumbing Handbook) notes that the nylon insert is not damaged by installation and therefore they can be reused many times,^[1] and a Federal Aviation Administration Advisory Circular allows nuts to be reused if the prevailing torque is within specification.^[3] However, an Air Force Technical Order requires replacement of self-locking nuts in critical areas.^[4] Various specifications for aerospace-grade self-locking nuts require that the running torque be maintained after a number of cycles of assembly, but without preloading the fastener.^[5]

References

1. Smith, Carroll (1990), Carroll Smith's Nuts, Bolts, Fasteners, and Plumbing Handbook, MotorBooks/MBI Publishing Company, p. 104, ISBN 0-87938-406-9.
2. Glossary of Terminology Related to Nuts and Bolts, retrieved 2008-11-25.
3. FAA AC43.13-1B
4. Air Force T.O. 1-1A-8
5. NASM 25027, SPECIFICATION, NUT, SELF-LOCKING, 250°F, 450°F, AND 800°F